Block Diagram

HT9480

Rev. 1.20

2

July 31, 2002

T S

I n t e r r u p t

C i r c u i t

I N T C

A L U

S h i f t e r

D a t a

M e m o r y

M U X

M P 0

I n s t r u c t i o n

R e g i s t e r

P r o g r a m

R O M

P o r t A

T i m i n g

G e n e r a t i o n

A C C

S t a t u s

P B 0 ~ P B 7

P C 0 ~ P C 1

P A 0 ~ P A 6

S Y S C L K / 4

M U X

P A

P B C

P B

T o n e

G e n e r a t o r

B Z

L o w

P o w e r

O s c i l l a t o r

L C D D r i v e r

P a g e r

D e c o d e r

X 1

X 2

V D D

V S S

B A L

B S 1

B S 2

1 . H

B P

D a t a R e a d y

( o r B a t t e r y . a i l )

I n t e r r u p t

1 E H

1 D H

f x 1 / 1 0 2 4

W D T S

W D T P r e s c a l e r

1 / 2 5 6

. r e q u e n c y

d i v i d e r

. O U T

O S C 1

S y s t e m

O s c i l l a t o r

R E S

P a g e r s u b - s y s t e m

O S C 2

S Y S C L K

B S 3

D I

W D T C L K

M P 1

P C 2

( L o w p o w e r c o n t r o l )

T M R 0

P C 3

( L C D p o w e r c o n t r o l )

T M R C 0

T M R 0 ( 8 b i t )

P A 7 w a k e - u p

P A 7 w a k e - u p

B A N K 2 7

C 0 H

E 2 H

P C

S T A C K 0

S T A C K 7

D e b o u n c e

P C 2

P C 3

W D T C L K

3 2 . 7 6 8 k H z

W D T O . .

W D T O . .

f x 1 / 1 0 2 4 o r f x 1 / 2 0 4 8

B A N K 2 7

4 0 H

4 E H

P C C

T S C

B A .

( 7 6 . 8 k H z / 1 5 3 . 6 k H z )

P r o g r a m

C o u n t e r

I n s t r u c t i o n

D e c o d e r

T M R C 1

T M R 1 ( 8 b i t )

S Y S C L K / 4

P o r t B

P o r t C

V L C D

2 / 3 V L C D

1 / 3 V L C D

3 2 . 7 6 8 k H z

T M R 1

T M R 0

C O M 0 ~ C O M 3

S E G 0 ~ S E G 3 4

*

N o t e : * : A s s u m e X 1 , X 2 u s e s a 7 6 . 8 k H z c r y s t a l

* * : D . ( D o u b l e . r e q u e n c y ) m e a n s X 1 i n p u t c l o c k f r e q u e n c y w i l l b e d o u b l e d . I f t h e d o u b l e

f r e q u e n c y m a s k o p t i o n i s s e l e c t e d , t h e d o u b l e f r e q u e n c y f u n c t i o n w i l l b e a c t i v a t e d .

T h e . O U T f r e q u e n c y i s 1 5 3 . 6 k H z i n t h i s c a s e .

* * * : T M R 0 i s d e r i v e d f r o m f x 1 / 1 0 2 4 , f x 1 i s t h e X 1 i n p u t c l o c k f r e q u e n c y .

D . * *

* * *